Improvement in manufacturing sheet-iron



UNITED STATES PATEN 1 ()FFICE.

W. DEWEES WOOD, OF MGKEESPORT, PENNSYLVANIA.

IMPROVEMENT IN MANUFACTURING SHEET-IRON.

Specification forming part of Letters Patent N0.13'7,5 $5, dated April8, 1873; application filed March 17, 1873.

To all whom it may concern:

Be it known that I, W. Dnwnns WOOD, of McKeesport, in the cou ty ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in the Mode of Finishing SheetIron; and I do hereby declarethe following to be a full, clear, and exact de scription thereof.

My invention consists in the mode of finish in g ShQGiJ-iIOD by, first,securing a non-oxidizable surface, in the manner hereinafter set forth;second, rolling and annealing; and, third, hammering in packs whilecold.

To enable others skilled in the art to make and use my invention I willproceed to describe the same.

The iron, after bein gbroken down into sheets by rolling, is cleaned ofits scale by acid and alkaline baths, and Washed with hot water in themanner usually practiced in the art; or the scale may be removed byother suitable process. The sheets are then immediately placed in ahot-air oven" and thoroughly dried, and, While still warm and free fromrust, they are plunged into a bath of graphite and oil, or an equivalentmixture of suitable consistency for coating the sheets therewith. Thesheets are then rolled in packs of three or more at a good rollingheat.After they are trimmed and annealed I arrange them in packs of, say,from ten to one hundred, more or less, and, while cold, subject suchpacks to the operation of hammering over their entire surface. With asystem of hammers operating at the rate of, say, twenty to forty blowsper minute, a medium-sized pack can be ordinarily hammered sufficientlyin about ten minutes, more or less, so as to impart to the sheets apolished surface superior to that of the best Russia sheetiron.

The graphite and oil any be applied separately, if so desired.

What I claim as my invention, and desire to secure by Letters Patent,is-

In the process of finishing sheet-iron, the combination of the following steps: First, coating the sheets separately with a graphite-andoilcoating; second, rolling and annealing; and, third, hammering in packswhile cold, substantially as set forth.

In testimony whereofI, the said IV. DEWEES WOOD, have hereunto set myhand.

W. DEWEES WOOD. Witnesses:

A. S. NIoHoLsoN, G. H. OHRISTY.

